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IAUC 6099: HD 5980; EXO 1846-031; 1993c; SATURN

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                                                  Circular No. 6099
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444     TWX 710-320-6842 ASTROGRAM CAM
MARSDEN@CFA.HARVARD.EDU or GREEN@CFA.HARVARD.EDU (science)


HD 5980
     R. Barba and V. Niemela, Observatorio Astronomico, La Plata,
communicate:  "Spectral observations (360-700 nm) obtained between
Oct. 24 and 27 with the REOSC echelle spectrograph + CCD attached
to the 2.15-m telescope at CASLEO Observatory, San Juan, show that
the brightest Wolf-Rayet eclipsing binary star in the SMC, HD 5980
(R.A. = 0h58m.62, Decl. = -72 deg 17'.9, equinox 1975.0; Azzopardi
and Vigneau 1982, A.Ap.Suppl. 50, 291), has brightened considerably
and completely changed its spectrum, which is now similar to eta
Car-type variables, with strong P-Cyg lines of He I and H Balmer, as
well as Fe III and N II lines.  From flux-calibrated spectra we
estimate that the continuum V brightened by about 1 mag with
respect to previous observations obtained with the same telescope
in Jan. and June, when it was at V = 11.0, already 0.8 mag brighter
than published values (cf. Azzopardi and Vigneau 1982, ibid.).
HD 5980 appears to be currently undergoing an eta Car-type outburst."


EXO 1846-031
     H. Inoue, F. Nagase, M. Ishida and T. Sonobe, on behalf of the
ASCA  team, communicate: "Following the report by Zhang et al. (IAUC
6096), ASCA observed EXO 1846-031 between Oct. 22.326 and 22.785 UT
with an exposure time of about 12 000 s.  No bright x-ray source was
seen in the ASCA GIS field within 20' of R.A. = 18h49m.1, Decl. =
-3 deg 08' (equinox 2000.0).  The 5-sigma upper limit of the 2-10-keV
flux at the position of EXO 1846-031 (Parmar et al. 1993, A.Ap. 279,
179) is 0.01 mCrab (2x10**-13 erg/cm**2/s, assuming the Crab Nebula
spectrum).  The upper limit increases to 0.04 mCrab at the rim of the
GIS field.  This suggests either that the outburst of EXO 1846-031
decayed very quickly or that the outburst detected by BATSE was not
from this source."


PERIODIC COMET TEMPEL 1 (1993c)
     Total visual magnitude estimates:  Sept. 3.16 UT, 11.5 (C. S.
Morris, Lockwood Valley, CA, 0.26-m reflector); 4.16, 11.5 (Morris,
Pine Mountain Club, CA, 0.26-m reflector).


SATURN
     Corrigendum.  On IAUC 6098, for  f, 13.800  read  f, 23.800.


1994 November 2                (6099)            Gareth V. Williams

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